Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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The Effect of Packing Density on the Warpage Behavior of Ni-Zn-Cu Ferrite Sheets

Ni-Zn-Cu계 페라이트 시트에서 충진 밀도에 따른 시트 휨 현상

  • Kim, Shi Yeon (Department of Materials Science and Engineering, Korea University) ;
  • Yeo, Dong-Hun (Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Shin, Hyo-Soon (Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Song, Woo Chang (Department of Electrical Engineering, Kangwon National University) ;
  • Yoon, Ho Gyu (Department of Materials Science and Engineering, Korea University)
  • 김시연 (고려대학교 신소재공학부) ;
  • 여동훈 (한국세라믹기술원 엔지니어링세라믹팀) ;
  • 신효순 (한국세라믹기술원 엔지니어링세라믹팀) ;
  • 송우창 (강원대학교 삼척캠퍼스 전기공학과) ;
  • 윤호규 (고려대학교 신소재공학부)
  • Received : 2015.11.04
  • Accepted : 2015.11.16
  • Published : 2015.12.01
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Abstract

It is necessary for ferrite sheets to be fabricated with high packing density for excellent electrical properties and high strength. In this study, the relationship between the warpage and the packing density of ferrite green sheet, was investigated with amount variation of organic additives. With 0.4 wt% of dispersant, the packing density was about 48% and warpage appeared 0.5~1.3 mm high. With 1.4 wt% of dispersant, the packing density increased up to 57% and warpage appeared 0.8~2.1 mm high. With high packing density, warpage appeared along the edges of specimen, while with low packing density, deformation appeared over whole specimen inhomogeneously. It is thought that inhomogeneous deformation after sintering came from the inhomogeneity in green sheet prepared with badly dispersed slurry. With good homogeneity in green sheet from well-dispersed slurry, isotropic shrinkage is thought to have occurred along the distance from center to edges of specimen during sintering.

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